$chunks = array (
    array (
            'name' => 'NewChunk',
            'description' => 'A test Chunk made with runProcessor.',
            'snippet' => '<h3>Chunkify!</h3>',
            'category' => '3'
        ),

    );
foreach ($chunks as $chunk) {
$response = $modx->runProcessor('element/chunk/create', $chunk);

$chunkArray = $response->getObject();
echo 'The chunk "'.$chunkArray['name'].' was created with ID '.$chunkArray['id']."\n";
}